US20060032645A1 - Electric hammer drill - Google Patents
Electric hammer drill Download PDFInfo
- Publication number
- US20060032645A1 US20060032645A1 US11/180,567 US18056705A US2006032645A1 US 20060032645 A1 US20060032645 A1 US 20060032645A1 US 18056705 A US18056705 A US 18056705A US 2006032645 A1 US2006032645 A1 US 2006032645A1
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- United States
- Prior art keywords
- cylinder
- mode
- disposed
- mode changing
- hammer
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/24—Damping the reaction force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D16/006—Mode changers; Mechanisms connected thereto
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
- B25D2211/003—Crossed drill and motor spindles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
- B25D2211/06—Means for driving the impulse member
- B25D2211/068—Crank-actuated impulse-driving mechanisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/065—Details regarding assembling of the tool
Definitions
- the present invention relates to an electric hammer drill that can switch operation modes to perform predetermined processing works on a work-piece.
- a known electric hammer drill to switch between a hammer mode and a hammer-drill mode is disclosed in Japanese non-examined laid-open Patent Publication No. 2002-192481.
- a piston is caused to reciprocate within a cylinder via a crank mechanism driven by a motor.
- a striker is linearly driven via air spring and the striking movement is transmitted to the tool bit via an intermediate element.
- a rotation transmitting mechanism is provided which transmits rotation of the motor from an intermediate shaft to the tool bit via the cylinder and a tool holder.
- a clutch mechanism is disposed in the rotation transmitting mechanism and is adapted to transmit rotation of the motor to the tool bit by engaging clutch claws and to prevent such transmission of rotation to the tool bit by disengaging the clutch claws. Further, a mode changing mechanism is provided which serves to switch the clutch mechanism between the state of transmitting rotation and the state of preventing the transmission of rotation. When the mode changing mechanism is switched to the hammer mode, the rotation of the tool bit is prevented so that an operation solely by a striking movement of the tool bit can be performed. When the mode changing mechanism is switched to the hammer-drill mode, rotation is transmitted to the tool bit so that an operation by a combined movement of striking and rotating can be performed.
- the center of gravity of the electric hammer drill is positioned below the axis of the cylinder and slightly forward of the axis of the motor.
- the user performs a predetermined operation by holding a handgrip on the opposite side of the tool bit, and a side handle. The greater the distance between the center of gravity and the axis of the cylinder, the larger the vibration in the longitudinal direction (the longitudinal direction of the cylinder) or in the vertical direction.
- the intermediate shaft of the rotation transmitting mechanism that transmits rotation of the motor to the cylinder (the tool bit) is placed forward of the motor and below the cylinder.
- the clutch mechanism that serves to releasably transmit the rotation is placed on the intermediate shaft.
- the mode changing mechanism that serves to switch the clutch mechanism between the engaged state and the disengaged state is placed near the clutch mechanism.
- the components for switching the operation modes of the tool bit are centralized in one area. In such a case, the weight of the lower part below the axis of the cylinder is further increased and the balance of weight is tipped.
- the center of gravity of the electric hammer drill is displaced farther downward away from the axis of the cylinder. Therefore, the known electric hammer is in difficulty to decrease operating vibration.
- the object of the invention is achieved by an electric hammer drill with a body, a motor, a striker, a cylinder, first and second power transmitting mechanisms, a power switching mechanism, a mode changing mechanism, and a coupling mechanism.
- the motor is housed within the body.
- the tool bit is disposed in a tip end region of the body.
- the striker linearly moves in the axial direction of the tool bit and causes the tool bit to perform a striking movement.
- the striker is slidably disposed in the cylinder.
- the first power transmitting mechanism causes the striker to move linearly by a rotating output of the motor
- the second power transmitting mechanism includes a region of transmitting rotation by engagement between a driving gear and a driven gear and causes the tool bit to rotate around its axis by a rotating output of the motor.
- the power switching mechanism can switch between a state of transmitting rotation of the motor to the hammer bit and a state of preventing the transmission of rotation, while keeping the driving gear and the driven gear of the second power transmitting mechanism in engagement with each other.
- the mode changing mechanism is disposed on the upper surface of the body and can change between a hammer-drill mode in which the tool bit is caused to perform a combined movement of striking and rotating and a hammer mode in which the tool bit is caused to perform only a striking movement.
- the coupling mechanism is disposed between the mode changing mechanism and the power switching mechanism and is adapted to cause the power switching mechanism to switch to the state of power transmission when the mode changing mechanism is switched to the hammer drill mode, while causing the power switching mechanism to switch to the state of preventing the power transmission when the mode changing mechanism is switched to the hammer mode.
- the coupling mechanism extends along the peripheral surface of the cylinder and transmits the mode changing movement of the mode changing mechanism to the power switching mechanism by moving in the longitudinal direction of the cylinder.
- the mode changing mechanism is disposed on the upper surface of the body and the coupling mechanism extends along the peripheral surface of the cylinder to move in the longitudinal direction of the cylinder, the center of gravity of the electric hammer drill is positioned nearer to the axis of the cylinder, compared with the known art in which the components for switching the operation modes are centralized in one area. As a result, operating vibration of the electric hammer drill is effectively alleviated.
- FIG. 1 is a sectional view schematically showing an entire electric hammer drill according to an embodiment of the invention.
- FIG. 2 is a sectional view of an essential part of the representative electric hammer drill, including a clutch operating mechanism, with clutches in engagement with each other.
- FIG. 3 is a sectional view of an essential part of the representative electric hammer drill including a clutch operating mechanism, with clutches in disengagement from each other.
- FIG. 4 is a sectional view showing a ring of the clutch operating mechanism.
- FIG. 5 is an illustration when viewed from the direction shown by arrow A in FIG. 4 .
- FIG. 1 shows an entire electric hammer drill 101 according to the embodiment of the present invention.
- FIGS. 2 and 3 show the essential part of the hammer drill 101 .
- FIG. 4 shows a ring of a coupling mechanism that actuates a clutch mechanism according to mode changing operation.
- the hammer drill 101 of the embodiment includes a body 103 , a tool holder 113 connected to the tip end region of the body 103 , and a hammer bit 115 detachably coupled to the tool holder 113 .
- the hammer bit 115 is held in the tool holder 113 such that it is allowed to slide with respect to the tool holder 113 in its longitudinal direction and prevented from rotating with respect to the tool holder 113 in its circumferential direction.
- the hammer bit 115 is a feature that corresponds to the “tool bit” according to the present invention.
- the body 103 includes a motor housing 105 that houses a driving motor 111 , a crank housing 106 that houses a motion converting mechanism 131 and a striking mechanism 117 , a gear housing 107 that houses a power transmitting mechanism 141 , and a handgrip 109 .
- the motion converting mechanism 131 is a feature that corresponds to the “first power transmitting mechanism” according to the invention.
- the driving motor 111 is mounted such that a rotating shaft 111 a of the driving motor runs substantially perpendicularly to the longitudinal direction of the body 103 (vertically as viewed in FIG. 1 ).
- the motion converting mechanism 131 is adapted to convert the rotating output of the driving motor 111 to linear motion and then to transmit it to the striking mechanism 117 .
- the motion converting mechanism 131 includes a crank mechanism driven by the driving motor 111 via a plurality of gears 132 , 134 .
- the crank mechanism includes a crank shaft 133 , a crank pin 135 mounted on the crank shaft 133 , a piston 137 , and a connecting rod 139 that connects the piston 137 and the crank pin 135 .
- the piston 137 is adapted to drive the striking mechanism 117 and can slide within a cylinder 121 in the axial direction of the hammer bit 115 .
- the motor 111 and the cylinder 121 are arranged such that their axes run generally perpendicularly to each other.
- the striking mechanism 117 includes a striker 118 and an intermediate element in the form of an impact bolt 119 .
- the striker 118 is slidably disposed within the bore of the cylinder 121 together with the piston 137 .
- the impact bolt 119 is slidably disposed within the tool holder 113 and serves to transmit the kinetic energy of the striker 118 to the hammer bit 115 .
- the tool holder 113 is disposed coaxially with the cylinder 121 and can rotate.
- the tool holder 113 is rotated by the driving motor 111 via the power transmitting mechanism 141 having a gear train.
- the power transmitting mechanism 141 is a feature that corresponds to the “second power transmitting mechanism” according to the invention.
- a clutch mechanism 151 is disposed in the power transmitting mechanism 141 and is adapted to enable or disable the power transmitting mechanism 141 to transmit rotation of the motor 111 to the tool holder 113 via the clutch mechanism 151 .
- the clutch mechanism 151 is a feature that corresponds to the “power switching mechanism” according to the invention.
- the power transmitting mechanism 141 includes an intermediate gear 143 driven by the motor 111 , an intermediate shaft 145 , a first bevel gear 147 and a second bevel gear 149 .
- Rotation of the intermediate gear 143 is transmitted to the intermediate shaft 145 via the clutch mechanism 151 .
- Rotation of the intermediate shaft 145 is in turn transmitted to the tool holder 113 via the first bevel gear 147 and the second bevel gear 149 that engages with the first bevel gear 147 .
- the first bevel gear 147 is integrally formed on the axial end of the intermediate shaft 145 .
- the second bevel gear 149 is disposed coaxially with the cylinder 121 and rotates together with the tool holder 113 .
- the intermediate shaft 145 is arranged parallel to the rotating shaft 11 a of the motor 111 and perpendicularly to the axis of the cylinder 121 .
- the first bevel gear 147 and the second bevel gear 149 are features that correspond to the “driving gear” and the “driven gear”, respectively, according to the invention.
- the clutch mechanism 151 includes engaging clutches, i.e. a driving clutch 153 and a driven clutch 155 .
- the driving clutch 153 is loosely fitted on the intermediate shaft 145 .
- the driven clutch 155 is fitted on the intermediate shaft 145 by spline engagement such that the driven clutch 155 can slide with respect to the intermediate shaft 145 in its axial direction and rotate together with the intermediate shaft 145 in its circumferential direction.
- the driving clutch 153 is coupled to the intermediate gear 143 rotated by the driving motor 111 , via a torque limiter 154 . When the driving motor 111 is driven, the driving clutch 153 rotates together with the intermediate gear 143 as long as the torque on the hammer bit 115 is below a threshold value set by the torque limiter 154 .
- the driving clutch 153 and the driven clutch 155 face with each other in the axial direction of the intermediate shaft 145 and have respective claws 153 a , 155 a on the opposed surfaces.
- the driven clutch 155 is urged toward the driving clutch 153 by the biasing force of a biasing member in the form of a clutch spring 157 .
- the driven clutch 155 transmits the rotation to the intermediate shaft 145 when the claws 155 a of the driven clutch 155 engage with the claws 153 a of the driving clutch 153 .
- the driven clutch 155 is separated from the driving clutch 153 against the biasing force of the clutch spring 157 , the claws 155 a and 153 a are disengaged from each other and thus the driven clutch 155 is prevented from transmitting the rotation. Switching control of the clutch mechanism 151 will be explained below.
- the hammer drill 101 includes a mode changing mechanism 161 .
- the mode changing mechanism 161 can change between a hammer-drill mode and a hammer mode.
- the hammer bit 115 is caused to perform a combined movement of striking and rotating.
- the hammer bit 115 is caused to perform a striking movement.
- the mode changing mechanism 161 includes a mode-changing operating member 163 .
- Engagement of the clutch mechanism 151 is controlled via a clutch operating mechanism 171 according to the switching operation of the mode-changing operating member 163 .
- the clutch operating mechanism 171 is a feature that corresponds to the “coupling mechanism” according to the present invention.
- the mode-changing operating member 163 is mounted externally on the upper surface of the motor housing 105 such that it can be operated by the user. Specifically, the mode-changing operating member 163 is disposed on the side opposite to the clutch mechanism 151 with respect to the cylinder 121 .
- the mode-changing operating member 163 includes a disc 163 a with an operating grip 163 b and is mounted on the motor housing 105 such that it can be turned in a horizontal plane.
- the operating grip 163 b is mounted on the upper surface of the disc 163 a and extends in the diametrical direction of the disc.
- One end of the operating grip 163 b in the diametrical direction is tapered and forms a switching position pointer.
- the two mode positions i.e. hammer drill mode position and hammer mode position, are marked on the motor housing 105 in predetermined intervals in the circumferential direction of the disc 163 a .
- an eccentric pin is mounted on the underside of the disc 163 a of the mode-changing operating member 163 in a position displaced from the center of rotation of the disc 163 a.
- the clutch operating mechanism 171 transmits the switching movement to the clutch mechanism 151 .
- the clutch operating mechanism 171 includes a frame member 173 that is generally U-shaped in plan view, a ring 175 (see FIGS. 4 and 5 ) and a wedge-shaped cam 177 .
- the frame member 173 is caused to move lineally in the longitudinal direction of the cylinder 121 (the axial direction of the hammer bit 115 ) by revolving movement of the eccentric pin 163 d when the mode-changing operating member 163 is turned in a horizontal plane.
- the ring 175 is coupled to the frame member 173 .
- the cam 177 is mounted on the ring 175 and adapted to control the engagement of the clutch mechanism 151 .
- the frame member 173 is disposed generally horizontally within the gear housing 107 .
- the ring 175 is a feature that corresponds to the “cylindrical element” according to the invention.
- the frame member 173 is generally U-shaped in plan view.
- the frame member 173 is disposed generally horizontally in a crank room within the crank housing 106 and coupled to the mode-changing operating member 163 on the base side.
- the frame member 173 is generally U-shaped having a base and two legs 173 b .
- a slot 173 a (shown in FIGS.
- the frame member 173 is formed in the base of the frame member 173 and engages with the eccentric pin 163 d .
- the legs 173 b extend toward the ring 175 through a space around the cylinder 121 .
- the frame member 173 is linearly moved in the longitudinal direction of the cylinder 121 by revolving movement of the eccentric pin 163 d .
- a guide 172 (partly shown in FIGS. 1 to 3 ) guides the frame member 173 to move linearly.
- the ring 175 is disposed around the outside of the cylinder 121 and can slide in the longitudinal direction of the tool holder 113 .
- the ring 175 has two leg pieces 176 (see FIG. 5 ) that extend from one axial end of the ring 175 toward the frame member 173 .
- the ends of the leg pieces 176 are coupled to the legs 173 b of the frame member 173 .
- the frame member 173 and the ring 175 move together horizontally in the longitudinal direction of the cylinder 121 .
- the frame member 173 and the leg pieces 176 form the “relay members” according to the invention.
- the cam 177 is mounted on the lower surface of the ring 175 and moves together with the ring 175 .
- the cam 177 lies apart from a clutch control member 159 of the clutch mechanism 151 when the mode-changing operating member 163 is in the hammer drill mode position (see FIG. 2 ). In this state, the claws 155 a of the driven clutch 155 are in engagement with the claws 153 a of the driving clutch 153 .
- a slanted surface 177 a of the cam 177 presses on the clutch control member 159 (see FIG. 3 ).
- the clutch control member 159 pushes the driven clutch 155 away from the driving clutch 153 against the biasing force of the clutch spring 157 , so that the claws 153 a and 155 a are disengaged from each other.
- the cam surface (contact surface that contacts the clutch control member 159 ) of the cam 177 is covered with an iron (steel) plate 178 for reinforcement, which ensures smooth sliding movement and increase of durability of the cam.
- claws 175 a are formed on the entire circumference of one axial end of the ring 175 .
- the claws 175 a respectively engage with claws 149 a (see FIGS. 1 to 3 ) formed on one axial end of the second bevel gear 149 , so that free rotation of the second bevel gear 149 is prevented.
- the hammer bit 115 is driven in the hammer mode, free rotation of the tool holder 113 and the hammer bit 115 is prevented.
- the frame member 173 is urged in the direction that causes engagement between the claws 175 a and 149 a , by a spring 174 disposed between the frame member 173 and the guide 172 . Further, a predetermined play is provided between the slot 173 a and the eccentric pin 163 d in the moving direction of the frame member 173 .
- the frame member 173 is caused to move via the eccentric pin 163 d toward the tip end (the hammer bit 115 ) of the hammer drill 101 .
- the ring 175 and the cam 177 also move in this direction and the cam 177 moves away from the clutch control member 159 .
- the engagement between the claws 155 a of the driven clutch 155 and the claws 153 a of the driving clutch 153 is maintained by the biasing force of the clutch spring 157 .
- the rotation of the driving motor 111 is transmitted as rotation to the tool holder 113 that can freely rotates on the same axis as the cylinder 121 and the hammer bit 111 (supported by the tool holder 113 such that the hammer bit 111 is prevented from rotating with respect to the tool holder 113 ) via the power transmitting mechanism 141 .
- the hammer bit 115 is driven with the combined movement of striking (hammering) and rotating (drilling) in the hammer drill mode.
- a predetermined hammer-drill operation is performed on the workpiece.
- the frame member 173 of the clutch operating mechanism 171 is caused to move via the eccentric pin 163 d toward the rear (the handgrip 109 ) of the hammer drill 101 .
- the ring 175 and the cam 177 also move in this direction and the slanted surface 177 a of the cam 177 presses on the clutch control member 159 by components of movement in a direction perpendicular to the moving direction of the cam 177 .
- the clutch control member 159 moves in the axial direction of the intermediate shaft 145 and pushes the driven clutch 155 away from the driving clutch 153 against the biasing force of the clutch spring 157 , so that the claws 153 a and 155 a are disengaged from each other. Therefore, the hammer bit 115 does not rotate in the hammer mode (see FIG. 3 ).
- the driving motor 111 is arranged such that its axis is perpendicular to the axis of the cylinder 121 .
- the center of gravity of the electric hammer drill 101 of this type is typically positioned below the axis of the cylinder 121 and slightly forward of the axis of the driving motor 111 . It is known that the greater the distance between the center of gravity and the axis of the cylinder 121 , the larger the vibration in the longitudinal direction (the longitudinal direction of the cylinder 121 ) or in the vertical direction as viewed in FIG. 1 (the direction of the axis of the driving motor 111 ).
- the mode changing mechanism 161 operated by the user is disposed on the upper surface of the body 103 above the cylinder 121 , while the clutch mechanism 151 is disposed below the cylinder 121 on the intermediate shaft 145 of the power transmitting mechanism 141 .
- the switching movement of the mode-changing operating member 163 is transmitted to the clutch mechanism 151 via the clutch operating mechanism 171 .
- components for switching the operation modes of the hammer bit 115 are arranged in a decentralized manner above and below the axis of the cylinder 121 .
- the center of gravity of the electric hammer drill 101 is positioned nearer to the axis of the cylinder 121 , compared with the known art in which the components for the switching the operation modes are centralized in one area. As a result, vibration which may be caused in the longitudinal direction or in the vertical direction during operation can be effectively alleviated or reduced.
- the mode changing mechanism 161 is disposed on the upper surface of the body 103 , the user can easily operate the mode changing mechanism 161 with one hand, left or right, while holding the handgrip 109 with the other hand.
- the user whether right-handed or left-handed, can more easily operate the mode changing mechanism 161 , so that the ease of use is enhanced.
- the clutch mechanism 151 In order to have the center of gravity in a position nearer to the axis of the cylinder 121 , it is more advantageous to dispose the clutch mechanism 151 coaxially with the cylinder 121 .
- the clutch mechanism 151 is disposed around the outer periphery of the cylinder 121 , which disadvantageously results in increase of the size in the radial direction and thus in increase of the weight.
- the clutch mechanism 151 is disposed coaxially with the intermediate shaft 145 of the power transmitting mechanism 141 . Therefore, the clutch mechanism 151 can be made smaller and takes up less space.
- the entire electric hammer drill 101 can be made compact.
- the ring 175 is disposed around the cylinder 121 and has the two leg pieces 176 that are diametrically opposed to each other with respect to the axis of the cylinder 121 and extend in the direction of the axis.
- the leg pieces 176 are coupled to the generally U-shaped frame member 173 .
- the driving motor 11 has been described as being arranged such that its axis is perpendicular to the axis of the cylinder 121 .
- the present invention may be applied to an electric hammer drill in which the axis of the driving motor 111 is parallel to the axis of the cylinder 121 .
- a swash plate mechanism is used as the motion converting mechanism that converts the rotating output of the driving motor 111 to linear motion.
- the axis of rotation of the power transmitting mechanism 141 that transmits rotation of the driving motor 111 to the hammer bit 115 , or the axis of the intermediate shaft 145 is parallel to the axis of the cylinder 121 and the axis of the driving motor 111 .
- the clutch mechanism 151 is disposed on the intermediate shaft 145 and can be configured to switch between the state of transmitting rotation of the motor 111 to the hammer bit 115 and the state of preventing the transmission of rotation while keeping the gears of the power transmitting mechanism 141 in engagement with each other, when the mode-changing operating member 163 is operated.
- the operation modes of the hammer bit 115 have been described as being switched between the hammer drill mode and the hammer mode.
- the operation modes may not be limited to these modes.
- the present invention may be constructed so as to allow the setting of a drill mode in which the hammer bit 115 only performs rotation or a neutral mode in which the hammer bit 115 does not perform rotation nor striking movement.
- the clutch operating mechanism 171 that engages or disengages the claws 153 a and 155 a of the clutch mechanism 151 according to the switching operation of the mode-changing operating member 163 , is not limited to the construction as shown in the drawings, but may be changed to a link mechanism.
Abstract
Description
- 1. Field of the Invention
- The present invention relates to an electric hammer drill that can switch operation modes to perform predetermined processing works on a work-piece.
- 2. Description of the Related Art
- A known electric hammer drill to switch between a hammer mode and a hammer-drill mode is disclosed in Japanese non-examined laid-open Patent Publication No. 2002-192481. In the known electric hammer drill, a piston is caused to reciprocate within a cylinder via a crank mechanism driven by a motor. Then, a striker is linearly driven via air spring and the striking movement is transmitted to the tool bit via an intermediate element. Further, a rotation transmitting mechanism is provided which transmits rotation of the motor from an intermediate shaft to the tool bit via the cylinder and a tool holder. A clutch mechanism is disposed in the rotation transmitting mechanism and is adapted to transmit rotation of the motor to the tool bit by engaging clutch claws and to prevent such transmission of rotation to the tool bit by disengaging the clutch claws. Further, a mode changing mechanism is provided which serves to switch the clutch mechanism between the state of transmitting rotation and the state of preventing the transmission of rotation. When the mode changing mechanism is switched to the hammer mode, the rotation of the tool bit is prevented so that an operation solely by a striking movement of the tool bit can be performed. When the mode changing mechanism is switched to the hammer-drill mode, rotation is transmitted to the tool bit so that an operation by a combined movement of striking and rotating can be performed.
- Generally, in an electric hammer drill in which the cylinder and the motor are arranged within the tool body such that the respective axes run generally crossing to each other to form “L” shape, the center of gravity of the electric hammer drill is positioned below the axis of the cylinder and slightly forward of the axis of the motor. The user performs a predetermined operation by holding a handgrip on the opposite side of the tool bit, and a side handle. The greater the distance between the center of gravity and the axis of the cylinder, the larger the vibration in the longitudinal direction (the longitudinal direction of the cylinder) or in the vertical direction. In the known electric hammer, the intermediate shaft of the rotation transmitting mechanism that transmits rotation of the motor to the cylinder (the tool bit) is placed forward of the motor and below the cylinder. The clutch mechanism that serves to releasably transmit the rotation is placed on the intermediate shaft. Further, the mode changing mechanism that serves to switch the clutch mechanism between the engaged state and the disengaged state is placed near the clutch mechanism. Thus, the components for switching the operation modes of the tool bit are centralized in one area. In such a case, the weight of the lower part below the axis of the cylinder is further increased and the balance of weight is tipped. Thus, the center of gravity of the electric hammer drill is displaced farther downward away from the axis of the cylinder. Therefore, the known electric hammer is in difficulty to decrease operating vibration.
- Accordingly, it is an object of the present teachings to provide an effective technique to alleviate vibration in the electric hammer drill.
- The object of the invention is achieved by an electric hammer drill with a body, a motor, a striker, a cylinder, first and second power transmitting mechanisms, a power switching mechanism, a mode changing mechanism, and a coupling mechanism. The motor is housed within the body. The tool bit is disposed in a tip end region of the body. The striker linearly moves in the axial direction of the tool bit and causes the tool bit to perform a striking movement. The striker is slidably disposed in the cylinder. The first power transmitting mechanism causes the striker to move linearly by a rotating output of the motor, while the second power transmitting mechanism includes a region of transmitting rotation by engagement between a driving gear and a driven gear and causes the tool bit to rotate around its axis by a rotating output of the motor. The power switching mechanism can switch between a state of transmitting rotation of the motor to the hammer bit and a state of preventing the transmission of rotation, while keeping the driving gear and the driven gear of the second power transmitting mechanism in engagement with each other.
- The mode changing mechanism is disposed on the upper surface of the body and can change between a hammer-drill mode in which the tool bit is caused to perform a combined movement of striking and rotating and a hammer mode in which the tool bit is caused to perform only a striking movement. The coupling mechanism is disposed between the mode changing mechanism and the power switching mechanism and is adapted to cause the power switching mechanism to switch to the state of power transmission when the mode changing mechanism is switched to the hammer drill mode, while causing the power switching mechanism to switch to the state of preventing the power transmission when the mode changing mechanism is switched to the hammer mode. The coupling mechanism extends along the peripheral surface of the cylinder and transmits the mode changing movement of the mode changing mechanism to the power switching mechanism by moving in the longitudinal direction of the cylinder.
- According to the invention, because the mode changing mechanism is disposed on the upper surface of the body and the coupling mechanism extends along the peripheral surface of the cylinder to move in the longitudinal direction of the cylinder, the center of gravity of the electric hammer drill is positioned nearer to the axis of the cylinder, compared with the known art in which the components for switching the operation modes are centralized in one area. As a result, operating vibration of the electric hammer drill is effectively alleviated.
- Other objects, features and advantages of the present invention will be readily understood after reading the following detailed description together with the accompanying drawings and the claims.
-
FIG. 1 is a sectional view schematically showing an entire electric hammer drill according to an embodiment of the invention. -
FIG. 2 is a sectional view of an essential part of the representative electric hammer drill, including a clutch operating mechanism, with clutches in engagement with each other. -
FIG. 3 is a sectional view of an essential part of the representative electric hammer drill including a clutch operating mechanism, with clutches in disengagement from each other. -
FIG. 4 is a sectional view showing a ring of the clutch operating mechanism. -
FIG. 5 is an illustration when viewed from the direction shown by arrow A inFIG. 4 . - Each of the additional features and method steps disclosed above and below may be utilized separately or in conjunction with other features and method steps to provide and manufacture improved electric hammer drills and method for using such electric hammer drills and devices utilized therein. Representative examples of the present invention, which examples utilized many of these additional features and method steps in conjunction, will now be described in detail with reference to the drawings. This detailed description is merely intended to teach a person skilled in the art further details for practicing preferred aspects of the present teachings and is not intended to limit the scope of the invention. Only the claims define the scope of the claimed invention. Therefore, combinations of features and steps disclosed within the following detailed description may not be necessary to practice the invention in the broadest sense, and are instead taught merely to particularly describe some representative examples of the invention, which detailed description will now be given with reference to the accompanying drawings.
- A representative embodiment of the present invention will now be described with reference to FIGS. 1 to 4.
FIG. 1 shows an entireelectric hammer drill 101 according to the embodiment of the present invention.FIGS. 2 and 3 show the essential part of thehammer drill 101.FIG. 4 shows a ring of a coupling mechanism that actuates a clutch mechanism according to mode changing operation. As shown inFIG. 1 , thehammer drill 101 of the embodiment includes abody 103, atool holder 113 connected to the tip end region of thebody 103, and ahammer bit 115 detachably coupled to thetool holder 113. Thehammer bit 115 is held in thetool holder 113 such that it is allowed to slide with respect to thetool holder 113 in its longitudinal direction and prevented from rotating with respect to thetool holder 113 in its circumferential direction. Thehammer bit 115 is a feature that corresponds to the “tool bit” according to the present invention. - The
body 103 includes amotor housing 105 that houses a drivingmotor 111, acrank housing 106 that houses amotion converting mechanism 131 and astriking mechanism 117, agear housing 107 that houses apower transmitting mechanism 141, and ahandgrip 109. Themotion converting mechanism 131 is a feature that corresponds to the “first power transmitting mechanism” according to the invention. Thedriving motor 111 is mounted such that arotating shaft 111 a of the driving motor runs substantially perpendicularly to the longitudinal direction of the body 103 (vertically as viewed inFIG. 1 ). Themotion converting mechanism 131 is adapted to convert the rotating output of thedriving motor 111 to linear motion and then to transmit it to thestriking mechanism 117. As a result, an impact force is generated in the axial direction of thehammer bit 115 via thestriking mechanism 117. Themotion converting mechanism 131 includes a crank mechanism driven by thedriving motor 111 via a plurality ofgears crank shaft 133, acrank pin 135 mounted on thecrank shaft 133, apiston 137, and a connectingrod 139 that connects thepiston 137 and thecrank pin 135. Thepiston 137 is adapted to drive thestriking mechanism 117 and can slide within acylinder 121 in the axial direction of thehammer bit 115. Themotor 111 and thecylinder 121 are arranged such that their axes run generally perpendicularly to each other. - The
striking mechanism 117 includes astriker 118 and an intermediate element in the form of animpact bolt 119. Thestriker 118 is slidably disposed within the bore of thecylinder 121 together with thepiston 137. Theimpact bolt 119 is slidably disposed within thetool holder 113 and serves to transmit the kinetic energy of thestriker 118 to thehammer bit 115. - The
tool holder 113 is disposed coaxially with thecylinder 121 and can rotate. Thetool holder 113 is rotated by the drivingmotor 111 via thepower transmitting mechanism 141 having a gear train. Thepower transmitting mechanism 141 is a feature that corresponds to the “second power transmitting mechanism” according to the invention. Aclutch mechanism 151 is disposed in thepower transmitting mechanism 141 and is adapted to enable or disable thepower transmitting mechanism 141 to transmit rotation of themotor 111 to thetool holder 113 via theclutch mechanism 151. Theclutch mechanism 151 is a feature that corresponds to the “power switching mechanism” according to the invention. - As shown in
FIGS. 2 and 3 , thepower transmitting mechanism 141 includes anintermediate gear 143 driven by themotor 111, anintermediate shaft 145, afirst bevel gear 147 and asecond bevel gear 149. Rotation of theintermediate gear 143 is transmitted to theintermediate shaft 145 via theclutch mechanism 151. Rotation of theintermediate shaft 145 is in turn transmitted to thetool holder 113 via thefirst bevel gear 147 and thesecond bevel gear 149 that engages with thefirst bevel gear 147. Thefirst bevel gear 147 is integrally formed on the axial end of theintermediate shaft 145. Thesecond bevel gear 149 is disposed coaxially with thecylinder 121 and rotates together with thetool holder 113. Theintermediate shaft 145 is arranged parallel to the rotating shaft 11 a of themotor 111 and perpendicularly to the axis of thecylinder 121. Thefirst bevel gear 147 and thesecond bevel gear 149 are features that correspond to the “driving gear” and the “driven gear”, respectively, according to the invention. - The
clutch mechanism 151 includes engaging clutches, i.e. a driving clutch 153 and a drivenclutch 155. The driving clutch 153 is loosely fitted on theintermediate shaft 145. The drivenclutch 155 is fitted on theintermediate shaft 145 by spline engagement such that the driven clutch 155 can slide with respect to theintermediate shaft 145 in its axial direction and rotate together with theintermediate shaft 145 in its circumferential direction. The driving clutch 153 is coupled to theintermediate gear 143 rotated by the drivingmotor 111, via atorque limiter 154. When the drivingmotor 111 is driven, the driving clutch 153 rotates together with theintermediate gear 143 as long as the torque on thehammer bit 115 is below a threshold value set by thetorque limiter 154. The driving clutch 153 and the driven clutch 155 face with each other in the axial direction of theintermediate shaft 145 and haverespective claws clutch 155 is urged toward the driving clutch 153 by the biasing force of a biasing member in the form of aclutch spring 157. The driven clutch 155 transmits the rotation to theintermediate shaft 145 when theclaws 155 a of the driven clutch 155 engage with theclaws 153 a of the drivingclutch 153. When the drivenclutch 155 is separated from the driving clutch 153 against the biasing force of theclutch spring 157, theclaws clutch 155 is prevented from transmitting the rotation. Switching control of theclutch mechanism 151 will be explained below. - The
hammer drill 101 includes amode changing mechanism 161. Themode changing mechanism 161 can change between a hammer-drill mode and a hammer mode. In the hammer drill mode, thehammer bit 115 is caused to perform a combined movement of striking and rotating. In the hammer mode, thehammer bit 115 is caused to perform a striking movement. - As shown in
FIGS. 2 and 3 , themode changing mechanism 161 includes a mode-changingoperating member 163. Engagement of theclutch mechanism 151 is controlled via aclutch operating mechanism 171 according to the switching operation of the mode-changingoperating member 163. Theclutch operating mechanism 171 is a feature that corresponds to the “coupling mechanism” according to the present invention. The mode-changingoperating member 163 is mounted externally on the upper surface of themotor housing 105 such that it can be operated by the user. Specifically, the mode-changingoperating member 163 is disposed on the side opposite to theclutch mechanism 151 with respect to thecylinder 121. The mode-changingoperating member 163 includes adisc 163 a with anoperating grip 163 b and is mounted on themotor housing 105 such that it can be turned in a horizontal plane. Although not shown, the operatinggrip 163 b is mounted on the upper surface of thedisc 163 a and extends in the diametrical direction of the disc. One end of the operatinggrip 163 b in the diametrical direction is tapered and forms a switching position pointer. The two mode positions, i.e. hammer drill mode position and hammer mode position, are marked on themotor housing 105 in predetermined intervals in the circumferential direction of thedisc 163 a. Further, an eccentric pin is mounted on the underside of thedisc 163 a of the mode-changingoperating member 163 in a position displaced from the center of rotation of thedisc 163 a. - When the mode-changing
operating member 163 is operated to switch between the modes, theclutch operating mechanism 171 transmits the switching movement to theclutch mechanism 151. As shown inFIGS. 2 and 3 , theclutch operating mechanism 171 includes aframe member 173 that is generally U-shaped in plan view, a ring 175 (seeFIGS. 4 and 5 ) and a wedge-shapedcam 177. Theframe member 173 is caused to move lineally in the longitudinal direction of the cylinder 121 (the axial direction of the hammer bit 115) by revolving movement of theeccentric pin 163 d when the mode-changingoperating member 163 is turned in a horizontal plane. Thering 175 is coupled to theframe member 173. Thecam 177 is mounted on thering 175 and adapted to control the engagement of theclutch mechanism 151. Theframe member 173 is disposed generally horizontally within thegear housing 107. Thering 175 is a feature that corresponds to the “cylindrical element” according to the invention. Theframe member 173 is generally U-shaped in plan view. Theframe member 173 is disposed generally horizontally in a crank room within thecrank housing 106 and coupled to the mode-changingoperating member 163 on the base side. Specifically, theframe member 173 is generally U-shaped having a base and twolegs 173 b. Aslot 173 a (shown in FIGS. 1 to 3 in sectional view) is formed in the base of theframe member 173 and engages with theeccentric pin 163 d. Thelegs 173 b extend toward thering 175 through a space around thecylinder 121. Theframe member 173 is linearly moved in the longitudinal direction of thecylinder 121 by revolving movement of theeccentric pin 163 d. A guide 172 (partly shown in FIGS. 1 to 3) guides theframe member 173 to move linearly. - The
ring 175 is disposed around the outside of thecylinder 121 and can slide in the longitudinal direction of thetool holder 113. Thering 175 has two leg pieces 176 (seeFIG. 5 ) that extend from one axial end of thering 175 toward theframe member 173. The ends of theleg pieces 176 are coupled to thelegs 173 b of theframe member 173. Thus, theframe member 173 and thering 175 move together horizontally in the longitudinal direction of thecylinder 121. Theframe member 173 and theleg pieces 176 form the “relay members” according to the invention. Thecam 177 is mounted on the lower surface of thering 175 and moves together with thering 175. Thecam 177 lies apart from aclutch control member 159 of theclutch mechanism 151 when the mode-changingoperating member 163 is in the hammer drill mode position (seeFIG. 2 ). In this state, theclaws 155 a of the driven clutch 155 are in engagement with theclaws 153 a of the drivingclutch 153. When the mode-changingoperating member 163 is turned to the hammer mode position, a slanted surface 177 a of thecam 177 presses on the clutch control member 159 (seeFIG. 3 ). As a result, theclutch control member 159 pushes the driven clutch 155 away from the driving clutch 153 against the biasing force of theclutch spring 157, so that theclaws cam 177 is covered with an iron (steel)plate 178 for reinforcement, which ensures smooth sliding movement and increase of durability of the cam. - As shown in
FIGS. 4 and 5 ,claws 175 a are formed on the entire circumference of one axial end of thering 175. When the mode-changingoperating member 163 is turned to the hammer mode position, theclaws 175 a respectively engage withclaws 149 a (see FIGS. 1 to 3) formed on one axial end of thesecond bevel gear 149, so that free rotation of thesecond bevel gear 149 is prevented. Thus, when thehammer bit 115 is driven in the hammer mode, free rotation of thetool holder 113 and thehammer bit 115 is prevented. In order to achieve smooth engagement between theclaws frame member 173 is urged in the direction that causes engagement between theclaws spring 174 disposed between theframe member 173 and theguide 172. Further, a predetermined play is provided between theslot 173 a and theeccentric pin 163 d in the moving direction of theframe member 173. - Operation and usage of the
hammer drill 101 constructed as described above will now be explained. - As shown in
FIG. 2 , when the user turns the mode-changingoperating member 163 to the hammer drill mode position, theframe member 173 is caused to move via theeccentric pin 163 d toward the tip end (the hammer bit 115) of thehammer drill 101. Thus, thering 175 and thecam 177 also move in this direction and thecam 177 moves away from theclutch control member 159. As a result, the engagement between theclaws 155 a of the drivenclutch 155 and theclaws 153 a of the driving clutch 153 is maintained by the biasing force of theclutch spring 157. - In this state, when the
trigger 123 on thehandgrip 109 is depressed to drive the drivingmotor 111, the rotation of the drivingmotor 111 is converted into linear motion via themotion converting mechanism 131. Thepiston 137 of themotion converting mechanism 131 then reciprocates within the bore of thecylinder 121. The linear motion of thepiston 137 causes thestriker 118 of thestriking mechanism 117 to move via air spring. The linear motion is further transmitted to thehammer bit 111 via theimpact bolt 119. Further, the rotation of the drivingmotor 111 is transmitted as rotation to thetool holder 113 that can freely rotates on the same axis as thecylinder 121 and the hammer bit 111 (supported by thetool holder 113 such that thehammer bit 111 is prevented from rotating with respect to the tool holder 113) via thepower transmitting mechanism 141. Specifically, thehammer bit 115 is driven with the combined movement of striking (hammering) and rotating (drilling) in the hammer drill mode. Thus, a predetermined hammer-drill operation is performed on the workpiece. - When the user turns the mode-changing
operating member 163 from the hammer drill mode position to the hammer mode position, theframe member 173 of theclutch operating mechanism 171 is caused to move via theeccentric pin 163 d toward the rear (the handgrip 109) of thehammer drill 101. Thus, thering 175 and thecam 177 also move in this direction and the slanted surface 177 a of thecam 177 presses on theclutch control member 159 by components of movement in a direction perpendicular to the moving direction of thecam 177. As a result, theclutch control member 159 moves in the axial direction of theintermediate shaft 145 and pushes the driven clutch 155 away from the driving clutch 153 against the biasing force of theclutch spring 157, so that theclaws hammer bit 115 does not rotate in the hammer mode (seeFIG. 3 ). - In this state, when the
trigger 123 is depressed to drive the drivingmotor 111, the rotation of the drivingmotor 111 is converted into linear motion via themotion converting mechanism 131. Then, the linear motion is transmitted to thehammer bit 111 via thestriker 118 of thestriking mechanism 117 and theimpact bolt 119. At this time, theclutch mechanism 151 of thepower transmitting mechanism 141 is in the disengaged state, so that rotation is not transmitted to thehammer bit 115. Therefore, in the hammer mode, the user can perform a predetermined hammering operation solely by the striking movement (hammering) of thehammer bit 115. - In the
electric hammer drill 101 of this embodiment, the drivingmotor 111 is arranged such that its axis is perpendicular to the axis of thecylinder 121. The center of gravity of theelectric hammer drill 101 of this type is typically positioned below the axis of thecylinder 121 and slightly forward of the axis of the drivingmotor 111. It is known that the greater the distance between the center of gravity and the axis of thecylinder 121, the larger the vibration in the longitudinal direction (the longitudinal direction of the cylinder 121) or in the vertical direction as viewed inFIG. 1 (the direction of the axis of the driving motor 111). - In this respect, according to the embodiment, the
mode changing mechanism 161 operated by the user is disposed on the upper surface of thebody 103 above thecylinder 121, while theclutch mechanism 151 is disposed below thecylinder 121 on theintermediate shaft 145 of thepower transmitting mechanism 141. The switching movement of the mode-changingoperating member 163 is transmitted to theclutch mechanism 151 via theclutch operating mechanism 171. Specifically, components for switching the operation modes of thehammer bit 115 are arranged in a decentralized manner above and below the axis of thecylinder 121. Thus, the center of gravity of theelectric hammer drill 101 is positioned nearer to the axis of thecylinder 121, compared with the known art in which the components for the switching the operation modes are centralized in one area. As a result, vibration which may be caused in the longitudinal direction or in the vertical direction during operation can be effectively alleviated or reduced. - Further, with the construction in which the
mode changing mechanism 161 is disposed on the upper surface of thebody 103, the user can easily operate themode changing mechanism 161 with one hand, left or right, while holding thehandgrip 109 with the other hand. Specifically, compared with the known art construction in which themode changing mechanism 161 is disposed on the side surface of thebody 103, the user, whether right-handed or left-handed, can more easily operate themode changing mechanism 161, so that the ease of use is enhanced. - In order to have the center of gravity in a position nearer to the axis of the
cylinder 121, it is more advantageous to dispose theclutch mechanism 151 coaxially with thecylinder 121. However, in such a case, theclutch mechanism 151 is disposed around the outer periphery of thecylinder 121, which disadvantageously results in increase of the size in the radial direction and thus in increase of the weight. According to this embodiment, theclutch mechanism 151 is disposed coaxially with theintermediate shaft 145 of thepower transmitting mechanism 141. Therefore, theclutch mechanism 151 can be made smaller and takes up less space. Thus, advantageously, the entireelectric hammer drill 101 can be made compact. - Further, in the
clutch operating mechanism 171 of this embodiment, thering 175 is disposed around thecylinder 121 and has the twoleg pieces 176 that are diametrically opposed to each other with respect to the axis of thecylinder 121 and extend in the direction of the axis. Theleg pieces 176 are coupled to the generallyU-shaped frame member 173. With this construction, when the mode-changingoperating member 163 is operated to switch between the modes, the switching movement is transmitted to thering 175 via the twoleg pieces 176 diametrically opposed to each other with respect to the axis of thecylinder 121. Therefore, thering 175 is moved with stability while keeping its balance. Thus, the switching movement of theclutch mechanism 151 is reliably performed. - Further, according to the embodiment, the driving motor 11 has been described as being arranged such that its axis is perpendicular to the axis of the
cylinder 121. However, the present invention may be applied to an electric hammer drill in which the axis of the drivingmotor 111 is parallel to the axis of thecylinder 121. In this case, a swash plate mechanism is used as the motion converting mechanism that converts the rotating output of the drivingmotor 111 to linear motion. In such a hammer drill that utilizes the swash plate mechanism, the axis of rotation of thepower transmitting mechanism 141 that transmits rotation of the drivingmotor 111 to thehammer bit 115, or the axis of theintermediate shaft 145, is parallel to the axis of thecylinder 121 and the axis of the drivingmotor 111. In this case, too, theclutch mechanism 151 is disposed on theintermediate shaft 145 and can be configured to switch between the state of transmitting rotation of themotor 111 to thehammer bit 115 and the state of preventing the transmission of rotation while keeping the gears of thepower transmitting mechanism 141 in engagement with each other, when the mode-changingoperating member 163 is operated. - Further, according to the embodiment, the operation modes of the
hammer bit 115 have been described as being switched between the hammer drill mode and the hammer mode. The operation modes may not be limited to these modes. For example, the present invention may be constructed so as to allow the setting of a drill mode in which thehammer bit 115 only performs rotation or a neutral mode in which thehammer bit 115 does not perform rotation nor striking movement. Further, theclutch operating mechanism 171 that engages or disengages theclaws clutch mechanism 151 according to the switching operation of the mode-changingoperating member 163, is not limited to the construction as shown in the drawings, but may be changed to a link mechanism. -
- 101 electric hammer drill
- 103 body
- 105 motor housing
- 106 crank housing
- 107 gear housing
- 109 handgrip
- 111 driving motor (motor)
- 111 a rotating shaft
- 113 tool holder
- 115 hammer bit (tool bit)
- 117 striking mechanism
- 118 striker
- 119 impact bolt (intermediate element)
- 121 cylinder
- 123 trigger
- 131 motion converting mechanism (first power transmitting mechanism)
- 132 gear
- 133 crank shaft
- 134 gear
- 135 crank pin
- 137 piston
- 139 connecting rod
- 141 power transmitting mechanism (second power transmitting mechanism)
- 143 intermediate gear
- 145 intermediate shaft
- 147 first bevel gear
- 149 second bevel gear
- 149 a claw
- 151 clutch mechanism (power switching mechanism)
- 153 driving clutch
- 153 a claw
- 154 torque limiter
- 155 driven clutch
- 155 a claw
- 157 clutch spring
- 159 clutch control member
- 161 mode-changing mechanism
- 163 mode-changing operating member
- 163 a disc
- 163 b operating grip
- 163 d eccentric pin
- 171 clutch operating mechanism (coupling mechanism)
- 172 guide
- 173 frame member (relay member)
- 173 a slot
- 173 b leg
- 174 spring
- 175 ring
- 175 a claw
- 176 leg piece (relay member)
- 177 cam
- 177 a slanted surface
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004212043A JP4515181B2 (en) | 2004-07-20 | 2004-07-20 | Electric hammer drill |
JP2004-212043 | 2004-07-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20060032645A1 true US20060032645A1 (en) | 2006-02-16 |
US7383893B2 US7383893B2 (en) | 2008-06-10 |
Family
ID=35721664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/180,567 Expired - Fee Related US7383893B2 (en) | 2004-07-20 | 2005-07-14 | Electric hammer drill |
Country Status (4)
Country | Link |
---|---|
US (1) | US7383893B2 (en) |
JP (1) | JP4515181B2 (en) |
CN (1) | CN100366397C (en) |
DE (1) | DE102005033672B4 (en) |
Cited By (5)
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WO2011072907A1 (en) * | 2009-12-15 | 2011-06-23 | Robert Bosch Gmbh | Hand-power tool |
US20120205132A1 (en) * | 2010-01-21 | 2012-08-16 | Wenjiang Wang | Light single-button multifunctional electric hammer |
US10919137B2 (en) | 2017-03-03 | 2021-02-16 | Makita Corporation | Work tool |
US20220395971A1 (en) * | 2021-06-10 | 2022-12-15 | Makita Corporation | Power tool having rotary hammer mechanism |
US20220395972A1 (en) * | 2021-06-10 | 2022-12-15 | Makita Corporation | Power tool having rotary hammer mechanism |
Families Citing this family (20)
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JP4742613B2 (en) * | 2005-02-24 | 2011-08-10 | マックス株式会社 | Drill tool |
JP4812471B2 (en) * | 2006-03-09 | 2011-11-09 | 株式会社マキタ | Work tools |
DE102007000056A1 (en) * | 2007-01-31 | 2008-09-18 | Hilti Aktiengesellschaft | Vibration damper for hand tool |
JP5009005B2 (en) * | 2007-02-15 | 2012-08-22 | 株式会社マキタ | Hammer drill |
RU2477212C2 (en) * | 2007-03-26 | 2013-03-10 | Макита Корпорейшн | Percussion tool |
JP5026834B2 (en) * | 2007-03-26 | 2012-09-19 | 株式会社マキタ | Hammer drill |
JP5171085B2 (en) * | 2007-03-28 | 2013-03-27 | 株式会社マキタ | Impact tool |
JP5431000B2 (en) * | 2009-04-01 | 2014-03-05 | 株式会社マキタ | Hammer drill |
GB0912283D0 (en) * | 2009-07-15 | 2009-08-26 | Black & Decker Inc | Motor driven hammer having means for controlling the power of impact |
JP5496605B2 (en) * | 2009-11-02 | 2014-05-21 | 株式会社マキタ | Impact tool |
DE102012209446A1 (en) * | 2012-06-05 | 2013-12-05 | Robert Bosch Gmbh | Hand machine tool device |
US9630307B2 (en) | 2012-08-22 | 2017-04-25 | Milwaukee Electric Tool Corporation | Rotary hammer |
CN103216193B (en) * | 2013-05-14 | 2015-01-21 | 安徽中龙建材科技有限公司 | Rectangular hole well drill |
GB201321893D0 (en) * | 2013-12-11 | 2014-01-22 | Black & Decker Inc | Rotary Hammer |
CN104786199B (en) * | 2014-11-07 | 2016-06-29 | 江苏东成机电工具有限公司 | A kind of mode-changeover device |
EP3251801A4 (en) * | 2015-01-28 | 2018-09-19 | Koki Holdings Kabushiki Kaisha | Impact tool |
CN107627263B (en) * | 2017-09-30 | 2023-11-10 | 苏州宝时得电动工具有限公司 | Electric hammer |
CN108982147B (en) * | 2018-08-06 | 2024-02-27 | 中国地质大学(武汉) | Plunger type vibration rotary sampling drilling machine based on space cam mechanism |
EP3822030A1 (en) * | 2019-11-15 | 2021-05-19 | Hilti Aktiengesellschaft | Drill and/or chisel hammer with impact device assembly |
JP1670515S (en) * | 2020-05-21 | 2020-10-19 |
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- 2005-07-14 US US11/180,567 patent/US7383893B2/en not_active Expired - Fee Related
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US4763733A (en) * | 1985-10-26 | 1988-08-16 | Hilti Aktiengesellschaft | Hammer drill with rotational lock |
US5775440A (en) * | 1995-08-18 | 1998-07-07 | Makita Corporation | Hammer drill with an idling strike prevention mechanism |
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US6015017A (en) * | 1997-04-18 | 2000-01-18 | Black & Decker Inc. | Rotary hammer |
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Publication number | Priority date | Publication date | Assignee | Title |
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WO2011072907A1 (en) * | 2009-12-15 | 2011-06-23 | Robert Bosch Gmbh | Hand-power tool |
US9527201B2 (en) | 2009-12-15 | 2016-12-27 | Robert Bosch Gmbh | Portable power tool |
US20120205132A1 (en) * | 2010-01-21 | 2012-08-16 | Wenjiang Wang | Light single-button multifunctional electric hammer |
US9227312B2 (en) * | 2010-01-21 | 2016-01-05 | Zhejiang Haiwang Electric Machine Co., Ltd. | Light single-button multifunctional electric hammer |
US10919137B2 (en) | 2017-03-03 | 2021-02-16 | Makita Corporation | Work tool |
US20220395971A1 (en) * | 2021-06-10 | 2022-12-15 | Makita Corporation | Power tool having rotary hammer mechanism |
US20220395972A1 (en) * | 2021-06-10 | 2022-12-15 | Makita Corporation | Power tool having rotary hammer mechanism |
Also Published As
Publication number | Publication date |
---|---|
US7383893B2 (en) | 2008-06-10 |
CN100366397C (en) | 2008-02-06 |
JP2006026854A (en) | 2006-02-02 |
DE102005033672A1 (en) | 2006-02-23 |
DE102005033672B4 (en) | 2009-04-23 |
JP4515181B2 (en) | 2010-07-28 |
CN1724222A (en) | 2006-01-25 |
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